AST251H1 Lecture : lecture note
Document Summary
Simpler to have sun in center occams razor, Kepler no move in circles but in ellipses, question why ellipses. Galielo saw the moons of jupiter, venus show faces. The laws of kepler, orbits sun on elliptical orbit in focus, move fastes closest to the sun, and slower further away, away is same over certain time same area, relation orbital period and distance, doestntell us how moons orbit. Newton, gravity more powerful, any two objects attract each other, with certain force depends on masses and idstance, inverse square, force between objects, 3 simple laws redict motion of a celestial bodies in the solar system, even moons however needed correction in the 20th century, more powerful predicts keplers and predicts for any object. It works but how, mercury doesn t move like it should, newtons law didn t work first time, Energy, kinetic energy, potrential energy, radiation, all can be converted into each other,